Abstract
The purpose of the present study was to evaluate the shear bond strength of resin-modified glass ionomer cement (RMGIC) and various materials utilized for orthodontic brackets and crown restorations. A conventional resin bonding system (Orthomite Superbond : SB) was used as a positive control. Three types of materials, such as metals, ceramics, and plastics, and human enamel as a control were prepared for this study. In the RMGIC study, the effect of surface treatment, such as primer treatment by functional monomer for metal and silane coupling for inorganic materials, was also considered in regard to the shear bond strength. The following results were obtained.
1. The shear bond strengths of SB to the tested materials were in the range of 27.8-39.8 MPa, nearly equivalent to those of SB to human enamel (39.0 MPa).
2. The shear bond strengths of RMGIC to the tested materials were in the range of 0.1-13.9 MPa, lower than those of SB to the tested materials and those of RMGIC to human enamel (25.6 MPa).
3. The shear bond strengths of RMGIC and all tested materials increased when a proper surface treatment, such as alloy primer or silane coupling agent, was applied to the tested materials. However, the shear bond strength of RMGIC to the polycarbonate showed the lowest level even after several surface treatments.
These results suggest that surface treatment on metals, ceramics, and most plastics would be effective for the adhesion of RMGIC. However, further modification or another surface treatment would be required for the bonding characteristics between RMGIC and polycarbonate.
